Class Vector2

include/SFML/System/Vector2.hpp:43–208

////////////////////////////////////////////////////////////
template <typename T>
class Vector2
{
public:
    ////////////////////////////////////////////////////////////
    /// \brief Default constructor
    ///
    /// Creates a `Vector2(0, 0)`.
    ///
    ////////////////////////////////////////////////////////////
    constexpr Vector2() = default;

    ////////////////////////////////////////////////////////////
    /// \brief Construct the vector from cartesian coordinates
    ///
    /// \param x X coordinate
    /// \param y Y coordinate
    ///
    ////////////////////////////////////////////////////////////
    constexpr Vector2(T x, T y);

    ////////////////////////////////////////////////////////////
    /// \brief Converts the vector to another type of vector
    ///
    ////////////////////////////////////////////////////////////
    template <typename U>
    constexpr explicit operator Vector2<U>() const;

    ////////////////////////////////////////////////////////////
    /// \brief Construct the vector from polar coordinates <i><b>(floating-point)</b></i>
    ///
    /// \param r   Length of vector (can be negative)
    /// \param phi Angle from X axis
    ///
    /// Note that this constructor is lossy: calling `length()` and `angle()`
    /// may return values different to those provided in this constructor.
    ///
    /// In particular, these transforms can be applied:
    /// * `Vector2(r, phi) == Vector2(-r, phi + 180_deg)`
    /// * `Vector2(r, phi) == Vector2(r, phi + n * 360_deg)`
    ///
    ////////////////////////////////////////////////////////////
    Vector2(T r, Angle phi);

    ////////////////////////////////////////////////////////////
    /// \brief Length of the vector <i><b>(floating-point)</b></i>.
    ///
    /// If you are not interested in the actual length, but only in comparisons, consider using `lengthSquared()`.
    ///
    ////////////////////////////////////////////////////////////
    [[nodiscard]] T length() const;

    ////////////////////////////////////////////////////////////
    /// \brief Square of vector's length.
    ///
    /// Suitable for comparisons, more efficient than `length()`.
    ///
    ////////////////////////////////////////////////////////////
    [[nodiscard]] constexpr T lengthSquared() const;